Buddy,
If its brass could it be a bushing that is wearing out? If so any decent machinist could get you the replacement bushing, bearing.
In the old VW rebuild days a job like that might cost a 6 pack, today maybe $30!
My fletcher 3000 has plastic bushings that wear out eventually. May be time to reorder a set or two from United and replace them. More preventitive maintainence than anything else!